Internal combustion engine



Sept 27 1932- H. c. EDWARDS 1,879,140

INTERNAL COMBUSTION ENGINE Filed Jan. 14. 1931 Patented Sept. 27, 1932 UNITED STATES PATENT OFFICE iHERBERT C. EDWARDS, F DETROIT, MICHIGAN,AASSIGNOR TO PACKARD KOTOR CAR COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN INTERNAL COMBUSTION Application led January 14, 1931. Serial No. 508,722.

This invention relates toy air-cooled in-I ternal combustion engines and more particularly to cylinder constructions therefor.

An object of the invention is to provide a novel and improved form of finned cylinder through which the rate of heat flow will be rapid.

Another object of the invention is `to provide a cylinder for air-cooled Dieselengmes in which a finned wall surrounding the combustion chamber is copper coated so that the rate of heat flow will be materially increased.

A further object of the invention is to provide a cylinder which is formed with a linned surface upon which is deposited a coating of copper which increases in thickness toward the cylinder.

Other objects of the invention will appear from the following description taken in connection with the drawing, which forms a part of this specification, and in which:

Fig. 1 is a vertical sectional view of a Diesel engine cylinder constructed in accordance with my invention;

Fig. 2 is an enlarged view of a fragmentof Fig. 1.

In the drawing, I have illustrated an aircooled cylinder of a Diesel'engine which includes the circular wall 10 and an integral head 11 formed of metal such as steel. A dome 12 is detachahly secured upon the cylinder head by bolts 13, and provides a housing for the upper part of the valves and the valve operating mechanism (notv shown). The cylinder is also formed with a ange 14 adapted to be clamped or otherwise secured against the outer surface of a crank case.

The interior of the cylinder, adjacent the head, forms a combustion chamber and air is admitted thereto and exhaust gas expelled therefrom through one or more ports, as indicated at 15. Charges of fuel oil are injected into the compressed air charges in thel cylinder by means of a pressure injection dcvice as indicated at 16.

It is the usual practice to provide air- ,cooled cylinders with fins, and it is well known that heat transfer conditions are best when the fins are tapered and spaced properly at their bases to allow an eficient flow of air therebetween. In following this practice I4 form the cylinder wall 1 0 with tapered fins 17 and 18, the fins 17 encircling the combustion chamber and the ns 18 encircling the surface thereof with metal as indicated atv 19, and for this purpose I preferably employ copper which can be readily electroplated. The spaces between the fins 17 are similar and are formed a greater distanceapart than the spaces between the fins 18 so that when coated with copper they will be spaced substantially the same as the fins 18. Thecop er is applied to the fins 17 and the c linder a jacent such fins so that the thic ness of the deposit gradually increases toward the cylinder.

Heat in the cylinder wall surrounding the combustion .chamber flows mainly into the copper on the cylinder and outwardly therefrom through the copper on the fins. As the rate of heat travel through the copper is several times faster than through the steel, the heat flow is materially increased by the coating 19. 4

While I have herein described in some detail a specific embodiment of my invention, which I deem to be new and advanta ecus and may specifically claim, I do not esire it to be understood that my invention is limited to the exact details of the construction, as it willv be apparent that changes may be made therein without departing from the spi-rit or scope of my invention. S

What I claim is:

1. In an internal combustion engine, a cylinder, heat transfer fins around the combustion chamber portion of the cylinder and coating means for the cylinder and fins around the combustion chamber portion of the cylinder, said coating means being thicker adjacent the cylinder wall and formed of the cylinder and fins.

2. In an internal combustion engine, a cylinder, heat transfer fins around the combustion chamber portion of the c linder, and a copper coating on the fins an the. cylinder therebetween, the coating being thickest between the fins.

3. In an internal combustion engine, a cylinder having outwardly tapering integral hns extending therefrom around the combustion chamber portion, and a cop er coating covering the exterior surface o the ins and the cylinder therebetween, the thickness of the coating on the ins varying with the thickness of the ns.

4. In an internal combustion engine, a cylinder, heat transfer iins encircling the cylinder around the combustion chamber portion, and a copper coating for the ns and the cylinder intermediate the ns, said coating increasing in thickness toward the cylinder.

5. In an internal combustion engine, a cylinder, heat transfer fins intimately associated with the cylinder wall exteriorly of the combustion chamber portion of the cylinder, and

a coating on the fins and the cylinder wall therebetween, said coating being thicker adjacent the cylinder wall and formed of metal having a higher rate of heat How than the cylinders and fins.

In testimony whereof I ax my signature.

HERBERT C. EDWARDS. 

